From what I could see though, that tutorial is either somewhat outdated or it doesn’t show the full picture.
Would it be possible to get:
A) Get a quick video that shows how one would make a very basic setup, like how to make the chair demo for android from start to finish.
B) Get a written guide of how to make the chair demo for android.
C) If you still have the Unreal project for the chair demo, you could simply make that available (but remove the plugin files to avoid people essentially getting the plugin for free, that way paying users only have to re-import them)
Option C is probably the most viable, as it would require the least amount of work I presume, and it would still be extremely helpful.